Effect of competition environment changes on the radial growth of Pinus koraiensis and Fraxinus mandshurica in mixed coniferous-broad-leaved forest

The dominant tree species Pinus koraiensis and Fraxinus mandshurica in the coniferous and broad-leaved mixed forest under 3 thinning intensity treatments (15%, 30% and 50%) were selected as the research objects, based on 3 retest data and tree rings The width data analyzes the competitive change characteristics of Korean pine and Fraxinus mandshurica under different thinning intensities, and explores the influence of the change of the competitive environment on the radial growth of the retained wood. The results show that 1) The proportion of single wood that changes in the competitive environment of the Korean pine retained wood varies with As the intensity of thinning increased, the proportion of reserved woods with weakened competition was positively correlated with the intensity of thinning, and the proportion of reserved woods from Korean pine with weakened competition in heavily thinned plots reached 63% at most. The proportion of single trees with changes in the wood competition environment is the same